BMW 8 Series (G15) (2018) is 1039 kg (2,291 lbs) lighter than GMC Sierra 2500HD (2016).
GMC Sierra 2500HD (2016) is 856 mm (33.70 inch) longer, 133 mm (5.24 inch) wider, 635 mm (25.00 inch) higher and has 1298 liters (45.84 ft3) bigger cargo space than BMW 8 Series (G15) (2018).
